Table 23: MPLS Terms and Acronyms (continued)
DefinitionTerm
Label-only-inferred-PSC LSP. The label value, and possibly the
EXP-bits, are used to determine the per-hop behavior applied to the
packet.
L-LSP
Label-switching router—An MPLS node that can forward layer 3
packets based on their labels
LSR
Multiprotocol Label Switching—Set of techniques enabling forwarding
of traffic using layer 2 and layer 3 information
MPLS
MPLS node that connects an MPLS domain with a node outside the
domain that either does not run MPLS or is in a different domain
MPLS edge node
MPLS edge node in the role of handling traffic as it leaves an MPLS
domain
MPLS egress node
MPLS edge node in the role of handling traffic as it enters an MPLS
domain
MPLS ingress node
Label carried in a packet header that represents a packet’s
forwarding equivalence class
MPLS label
A router running MPLS. An MPLS node is aware of MPLS control
protocols, operates one or more L3 routing protocols, and is capable
of forwarding packets based on labels. Optionally, an MPLS node
can be capable of forwarding native L3 packets.
MPLS node
The series of LSRs and links that form the path from an ingress LSR
to all of its egress LSRs. Each tunnel is uniquely identified by a
session object.
Point-to-multipoint tunnel
An RSVP-TE LSP with a single ingress LSR and one or more egress
LSRs. Incoming data is replicated at the branch nodes.
Point-to-multipoint LSP
PE—An LER at the edge of a service provider core that provides
ingress to or egress from a VPN
Provider edge router
P—An LSR within a service provider core that carries traffic for a
VPN
Provider core router
Resource Reservation Protocol; E Series routers do not support RSVPRSVP
Resource Reservation Protocol enhanced to support MPLS traffic
engineering; E Series routers support RSVP-TE
RSVP-TE
The portion of the LSP from one LSR to another LSR in a
point-to-multipoint tunnel.
Sub-LSP
The ability to control the path taken through a network or portion
of a network based on a set of traffic parameters (bandwidth, QoS
parameters, and so on). Traffic engineering (TE) enables
performance optimization of operational networks and their
resources.
Traffic engineering
MPLS Terms and Acronyms â– 205
Chapter 2: MPLS Overview
To Next Page
Loading...
Need help?
General
